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diff --git a/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h
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+++ b/Source/WebKit2/WebProcess/WebPage/CoordinatedGraphics/ThreadedCoordinatedLayerTreeHost.h
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+/*
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2013 Company 100, Inc.
+ * Copyright (C) 2014 Igalia S.L.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ThreadedCoordinatedLayerTreeHost_h
+#define ThreadedCoordinatedLayerTreeHost_h
+
+#if USE(COORDINATED_GRAPHICS_THREADED)
+
+#include "CoordinatedLayerTreeHost.h"
+#include "SimpleViewportController.h"
+#include "ThreadedCompositor.h"
+#include <wtf/OptionSet.h>
+
+namespace WebCore {
+class GraphicsContext;
+class GraphicsLayer;
+struct CoordinatedGraphicsState;
+}
+
+namespace WebKit {
+
+class AcceleratedSurface;
+class WebPage;
+
+class ThreadedCoordinatedLayerTreeHost final : public CoordinatedLayerTreeHost {
+public:
+    static Ref<ThreadedCoordinatedLayerTreeHost> create(WebPage&);
+    virtual ~ThreadedCoordinatedLayerTreeHost();
+
+private:
+    explicit ThreadedCoordinatedLayerTreeHost(WebPage&);
+
+    void scrollNonCompositedContents(const WebCore::IntRect& scrollRect) override;
+    void sizeDidChange(const WebCore::IntSize&) override;
+    void deviceOrPageScaleFactorChanged() override;
+    void pageBackgroundTransparencyChanged() override;
+
+    void contentsSizeChanged(const WebCore::IntSize&) override;
+    void didChangeViewportAttributes(WebCore::ViewportAttributes&&) override;
+
+    void invalidate() override;
+
+    void forceRepaint() override;
+    bool forceRepaintAsync(uint64_t callbackID) override { return false; }
+
+    void setIsDiscardable(bool) override;
+
+#if PLATFORM(GTK) && PLATFORM(X11) &&  !USE(REDIRECTED_XCOMPOSITE_WINDOW)
+    void setNativeSurfaceHandleForCompositing(uint64_t) override;
+#endif
+
+    class CompositorClient final : public ThreadedCompositor::Client {
+        WTF_MAKE_NONCOPYABLE(CompositorClient);
+    public:
+        CompositorClient(ThreadedCoordinatedLayerTreeHost& layerTreeHost)
+            : m_layerTreeHost(layerTreeHost)
+        {
+        }
+
+    private:
+        void renderNextFrame() override
+        {
+            m_layerTreeHost.renderNextFrame();
+        }
+
+        void commitScrollOffset(uint32_t layerID, const WebCore::IntSize& offset) override
+        {
+            m_layerTreeHost.commitScrollOffset(layerID, offset);
+        }
+
+        ThreadedCoordinatedLayerTreeHost& m_layerTreeHost;
+    };
+
+    void didChangeViewport();
+
+    // CompositingCoordinator::Client
+    void didFlushRootLayer(const WebCore::FloatRect&) override { }
+    void commitSceneState(const WebCore::CoordinatedGraphicsState&) override;
+
+    enum class DiscardableSyncActions {
+        UpdateSize = 1 << 1,
+        UpdateViewport = 1 << 2,
+        UpdateScale = 1 << 3,
+        UpdateBackground = 1 << 4
+    };
+
+    CompositorClient m_compositorClient;
+    std::unique_ptr<AcceleratedSurface> m_surface;
+    RefPtr<ThreadedCompositor> m_compositor;
+    SimpleViewportController m_viewportController;
+    float m_lastPageScaleFactor { 1 };
+    WebCore::IntPoint m_lastScrollPosition;
+    bool m_isDiscardable { false };
+    OptionSet<DiscardableSyncActions> m_discardableSyncActions;
+};
+
+} // namespace WebKit
+
+#endif // USE(COORDINATED_GRAPHICS_THREADED)
+
+#endif // ThreadedCoordinatedLayerTreeHost_h